JP2010122730A - Storage control apparatus and storage system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a storage control apparatus connected to a host computer and a storage device to control data input/output to/from the storage device which effectively uses storage in the storage control apparatus and performs reliable and prompt data input/output control. <P>SOLUTION: In the storage control apparatus including a central processing unit 110, a channel interface part 160, a disk interface part 170 and an input/output control unit 180, a main storage 120 includes a battery-backed-up volatile memory that can maintain nonvolatility of data for a predetermined time after power is turned off. The battery-backed-up main storage 120 and a storage 150 of the input/output control unit 180 form a memory address space serving as a cache of the storage control apparatus, and staging and destaging is performed between the cache and a disk drive device. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a storage control device and a storage system that improve the memory use efficiency of a control device that performs data input / output of the storage device.

  As a technique for utilizing a plurality of memories such as a disk cache used for data input / output control of a storage device including a plurality of disk devices, for example, Patent Document 1 discloses a disk cache connected to a disk control device. The apparatus is composed of a nonvolatile memory portion and a volatile memory portion, and the processing is completed when the output processing from the central processing unit is written to the nonvolatile portion of the disk cache device. A computer system is described in which a plurality of data on the non-volatile portion of the device is written together into a disk device.

  In addition, for example, in Patent Document 2, in order to improve data processing by reducing data write processing to a cache memory and to improve device performance, write data from a host computer / server is transferred by a data transfer control unit. A disk array device is described that performs double writing by transferring to a nonvolatile memory unit and a global cache memory unit via a switch unit.

  FIG. 11 shows an example of a schematic overall view of a storage system having a conventional nonvolatile memory. The storage system performs data writing and reading control (input / output control) to the disk drive device in response to input / output commands from the host computer by a storage control device CTL having a plurality of controllers (CTL0, CTL1). For example, the storage control device CTL0 stores an application program in the main storage device (volatile memory 1) and performs various controls according to instructions from the central processing unit (CPU). By using an input / output control program as the application program, it is possible to perform software control of data input / output by command control of the CPU.

  In addition, using a dedicated interface controller (channel IFCTL) connected to the host computer and a dedicated interface controller (disk IFCTL) connected to the hard disk drive, input / output is performed by a dedicated control circuit (IOCTL) that controls data input / output. Hardware control can be performed. The data input / output control circuit is connected to a non-volatile cache memory (non-volatile memory 2) even when the power is turned off. The data from the host computer is temporarily stored in the cache memory and stored in the cache memory. It is possible to control such as writing data to the hard disk device (destage), or reading data stored in the hard disk device and storing it in the cache memory (staging), and then transferring it to the host computer.

The volatile memory means a volatile memory in which stored data is erased when the power is turned off, such as a DRAM (Dynamic Random Access Memory) used for a main memory of a computer. Non-volatile memory is a memory that retains stored data even when the power is turned off, such as a flash memory, a non-volatile memory that retains stored data even when the power is turned off, a magnetic disk memory, or a volatile memory. It means a battery backup type memory that backs up a volatile memory with a power source and maintains non-volatility. In the input / output control of the storage control device, a battery backup type cache memory (memory 2) that maintains a non-volatile property for a predetermined time by a battery or a power source stored in a storage battery is used. .
JP 59-135563 A JP 2005-301419 A

  Volatile memory generally has a slow data input / output speed, and data is lost when the power is turned off. On the other hand, a non-volatile memory is generally a high-performance memory that has a high data input / output speed and maintains stored data even when the power is turned off, but is relatively expensive. In a storage control device that needs to use a large amount of cache memory, it is important to select an optimal memory configuration for the storage device used in the storage control device.

  In addition, when performing destaging and staging data input / output control between the cache memory and the hard disk device during input / output control of the storage control device, the data on the cache memory has already been written to the hard disk device, for example. If the data is not fatal even if it is deleted (clean data), or the data is updated, for example, the data is only in the cache memory, and if it is deleted, the data is repaired. Input / output control that can be handled accurately is necessary depending on whether the data is not possible (dirty data). Further, if the data to be input / output controlled is control data and is erased, it is necessary to be able to cope with the data depending on whether the data hinders the control or is simply stored by the user.

  The technology described in Patent Document 1 or 2 described above includes a disk cache device configured by a nonvolatile memory portion and a volatile memory portion, or both a nonvolatile cache memory and an external global cache device. In any document, nothing is disclosed about different memory storage means and storage methods depending on the type of information to be stored.

  The present invention is a storage control device that is connected to a host computer and a storage device and controls input / output of data to / from the storage device in accordance with a command from the host computer, in order to effectively utilize the storage device in the storage control device, The purpose is to perform highly reliable data input / output control promptly.

  The storage control device of the present invention includes a central processing unit connected to a main storage device, a channel interface unit connected to a host computer, a disk interface unit connected to a disk drive device, and an input / output control unit connected to the storage device. The main storage device is constituted by a battery-backed volatile memory in which data non-volatility is maintained for a predetermined time after the power is turned off, and the battery-backed main storage device and the input / output The storage device of the control unit forms a memory address space as a cache device of the storage control device, reads the data stored in the disk drive device, writes the data to the cache device, and stores the data in the cache device The disk drive And performing destaging processing to be written to location.

  The storage control device of the present invention also includes a central processing unit connected to the main storage device, a channel interface unit connected to the host computer, a disk interface unit connected to the disk drive device, and an input / output control connected to the storage device. And the main storage device and the storage device of the input / output control unit are configured by a battery-backed volatile memory in which data non-volatility is maintained for a predetermined time after the power is turned off. The battery-backed main storage device and the battery-backed storage device of the input / output control unit form a memory address space as a cache device of the storage control device, and store the data stored in the disk drive device. A staging process for reading and writing to the cache device; and It reads the data stored in the Yasshu device and performs destaging processing to be written to the disk drive device.

  Furthermore, the storage system of the present invention includes a central processing unit connected to the main storage device, a channel interface unit connected to the host computer, a disk interface unit connected to the disk drive device, and an input / output control unit connected to the storage device. A plurality of storage control devices comprising: a host computer connected to the storage control device via the channel interface unit; and a disk drive device connected to the storage control device via the disk interface unit. And having a backup of the main storage device of the plurality of storage control devices and the storage device of the input / output control unit for a predetermined time after power is turned off to maintain data non-volatility. Mainly configured with volatile memory and backed up by own battery The memory address space as a cache device of the storage system is formed by the storage device, the storage device backed up by the battery of the input / output control unit, the main storage device backed up by the battery of the other system and the storage device backed up by the battery of the input / output control unit Then, a staging process for reading data stored in the disk drive device and writing it to the cache device and a destaging process for reading data stored in the cache device and writing it to the disk drive device are performed.

  According to the present invention, it is possible to improve the utilization efficiency of a memory used for input / output control of a storage control device and a storage system. Also, staging and destaging input / output control between the cache memory of the storage control device and the storage device can be performed with high reliability and promptly.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic overall view of a storage system including a storage control apparatus according to the first embodiment, and FIG. 2 is an example of a storage area management table showing the configuration of the memory space of the storage control apparatus. FIG. 3 shows a schematic overall view of a storage system including the storage control apparatus of the second embodiment and FIG. 4 shows the storage control apparatus of the third embodiment.

  5 to 10 are flowcharts showing the contents of each process of the storage control apparatus of the present invention, FIG. 6 is a data write (Write) process, FIG. 7 is a process storage area securing process at the time of data write, and FIG. 9 shows data read processing, FIG. 9 shows processing storage area reservation processing at the time of data read, and FIG. 10 shows drive data transfer processing for data backup and remote copy.

  FIG. 1 is a schematic overall view of a storage system including a storage control apparatus according to a first embodiment of the present invention. FIG. 2 shows an example of a storage area management table showing the configuration of the memory space of the storage control apparatus of the present invention.

  In FIG. 1, 10 is a storage control system, 20 and 21 are host computers, 30 is a storage device (drive), 31 and 32 are disk devices, 100 and 101 are storage control devices, and 110 and 111 are central processing units (CPU). , 120 and 121 are main storage devices (memory 1), 130 and 131 are input / output control modules (IO modules), 141 is a program, 142 is management information, 143 is user data 1, 144 is user data 2, 150, 151 Indicates a cache memory (memory 2), 160 and 161 indicate a channel interface unit (channel IFCTL), 170 and 171 indicate a disk interface unit (disk IFCTL), and 180 and 181 indicate an input / output control unit (IOCTL).

  In the first embodiment, an input / output control module (IO module) 130 is configured from the input / output control unit (IOCTL) 180, the channel interface unit (channel IFCTL) 160, and the disk interface unit (disk IFCTL) 170 in FIG. However, this is merely an example of implementation, and the present invention is not limited to the example of implementation of the module shown in FIG. 1, and each is implemented as a separate module. Or, when the input / output control unit (IOCTL) 180 and the CPU 110 are mounted on the same substrate, and the channel interface unit (channel IFCTL) 160 and the disk interface unit (disk IFCTL) 170 are mounted as separate modules, etc. Implementation is possible.

  The storage control device 100 according to the first embodiment of the present invention includes a central processing unit (CPU) 110 having a memory (1) 120 as a main storage device, a channel interface unit (channel IFCTL) 160 connected to the host computer 20, and a storage. An input / output control module (IO module) 130 including a disk interface unit (disk IFCTL) 170 connected to the apparatus 30, a memory (2) 150 that is a cache memory, and an input / output control unit (IOCTL) 180 that controls input / output; It is composed of

  In the first embodiment of the present invention, the main storage device (memory 1) 120 is maintained non-volatile for a predetermined time by the power stored in the battery or the storage battery (data stored for a predetermined time even when the power is turned off). The main storage device (memory 1) is a battery backup (BBU: Battery Buck Up), and includes a program 141, management information 142, user data (1). During a predetermined time when 143 is stored and the battery is backed up, the central processing unit (CPU) 110 can operate the application program by the program 141 stored in the main storage device (memory 1).

  If an input / output control program for the storage control device is stored as the program 141, the central processing unit (CPU) 110 operates the input / output control program during a predetermined time when the battery is backed up even if the power is turned off. Further, the management information 143 stored in the main storage device (memory 1) 120 is also referred to, and the input / output module 130 is controlled to perform software control to input / output user data 1 and 2 to / from a predetermined storage device. It can be carried out.

  FIG. 2 shows an example of a storage area management table that is retrieved during data input / output control and indicates the configuration of the memory space of the storage control apparatus. In FIG. 2, 200 is a memory management table, 201 is a start address, 202 is an end address, 203 is a management unit, 204 is a use, 210 is a memory address data table, 211 is a cache address, 212 is a drive number, and 213 is a drive address. 214 show the status.

  The memory management table 200 includes columns of a start address 201, an end address 202, a management unit 203, and a usage 204, and the address position in the memory space of the data to be input / output controlled and the size of the input / output control data. And the usage information indicating whether the input / output control data is management information including control data or user data.

  The memory address data table 210 includes columns of a cache address 211, a drive number 212, a drive address 213, and a status 214, and includes a cache including a backed-up main storage device (memory 1) and a cache memory (memory 2). The cache address 211 in the memory space of the device, the drive number for identifying the storage device (disk) 30 corresponding to the data stored in the cache address, the drive address in the memory space of the storage device (disk) 30, and the stored data Manages the status information indicating the Dirty status that exists only in the cache device (memory 1, 2) and the Clean status that exists in both the cache device (memory 1, 2) and the storage device (disk) 30. There.

  In the storage control device, in the case of software control in which the central control unit (CPU) performs data input / output control, or the data input / output control is performed by a dedicated input / output controller (IOCTL) of the input / output module (IO module) 103. In the case of hardware control performed by the above, the storage area management table indicating the configuration of the memory space of the storage control device stored in the memory 1 or the memory 2 is searched and referenced to secure the storage process of the input / output process, Data write (Write) processing, data read (Read) processing, and data transfer processing are performed.

  FIG. 3 is a schematic overall view of a storage system including the storage control apparatus according to the second embodiment of the present invention. In FIG. 3, 10 is a storage control system, 20 and 21 are host computers, 30 is a storage device (drive), 31 and 32 are disk devices, 100 and 101 are storage control devices, and 110 and 111 are central processing units (CPU). , 120 and 121 are main storage devices (memory 1), 130 and 131 are input / output control modules (IO modules), 141 is a program, 142 is management information, 143 is user data 1, 144 is user data 2, 150, 151 Indicates a cache memory (memory 2), 160 and 161 indicate a channel interface unit (channel IFCTL), 170 and 171 indicate a disk interface unit (disk IFCTL), and 180 and 181 indicate an input / output control unit (IOCTL).

  In the second embodiment, an input / output control module (IO module) 130 is configured from the input / output control unit (IOCTL) 180, the channel interface unit (channel IFCTL) 160, and the disk interface unit (disk IFCTL) 170 in FIG. However, this is merely an example of implementation, and the present invention is not limited to the implementation example of the module shown in FIG. 3, and each is implemented as a separate module. Or, when the input / output control unit (IOCTL) 180 and the CPU 110 are mounted on the same substrate, and the channel interface unit (channel IFCTL) 160 and the disk interface unit (disk IFCTL) 170 are mounted as separate modules, etc. Implementation is possible.

  The storage control device 100 according to the second embodiment of the present invention includes a central processing unit (CPU) 110 having a memory (1) 120 as a main storage device, a channel interface unit (channel IFCTL) 160 connected to the host computer 20, and a storage. An input / output control module (IO module) 130 including a disk interface unit (disk IFCTL) 170 connected to the apparatus 30, a memory (2) 150 that is a cache memory, and an input / output control unit (IOCTL) 180 that controls input / output; It is composed of

  In the first embodiment of the present invention, the main storage device (memory 1) 120 is composed of a battery-backed volatile memory. However, in the storage control device of the second embodiment of the present invention, the main storage device (memory 1) 120 is used. In addition, the cache memory (memory 2) 150 is also composed of a battery-backed volatile memory, and both the main storage device (memory 1) 120 and the cache memory (memory 2) 150 are used as batteries or storage batteries. Non-volatileity is maintained for a predetermined time by the accumulated power (stored data is retained for a predetermined time even when the power is turned off), and both function as a cache device as a whole, or The battery-backed main storage device (memory 1) 120 is connected to the battery-backed cache memory ( Mori 2) may be configured to function as a 150 sub-memory.

  In the second embodiment of the present invention, a program 141 and user data (1) 143 are stored in a main memory (memory 1) that is backed up by a battery (BBU: Battery Buck Up), and is backed up by a battery (BBU: Battery Buck Up). The management information 142 and user data 2 are stored in the cache memory (memory 2) 150.

  During a predetermined time when the battery is backed up, the input / output control unit (IOCTL) of the input / output control module (IO module) 130 is cache-backed up by the hardware control incorporated in the input / output control unit (IOCTL). With reference to the management information stored in the memory (memory 2) 150, in response to an input / output command from the host computer 20, the storage device (drive) 30 and the main storage device (memory 1) 120 or cache memory ( Data input / output control between the memory 2) 150 and data input / output control between the main storage device (memory 1) 120 and the cache device of the cache memory (memory 2) 150 can be performed.

  FIG. 4 is a schematic overall view of a storage system including the storage control apparatus according to the third embodiment of the present invention. In FIG. 4, 10 is a storage control system, 20 and 21 are host computers, 30 is a storage device (drive), 31 and 32 are disk devices, 100 and 101 are storage control devices, and 110 and 111 are central processing units (CPU). , 120 and 121 are main storage devices (memory 1), 130 and 131 are input / output control modules (IO modules), 141 is a program, 142 is management information, 143 is user data 1, 144 is user data 2, 150, 151 Is a cache memory (memory 2), 160 and 161 are channel interfaces 1 and 2 (channel IFCTL), 170 and 171 are disk interface units (disk IFCTL), and 180 and 181 are input / output control units (IOCTL). ing.

  In the third embodiment, FIG. 4 shows input / output control modules (IOCTLs) 180 and 181, channel interface units (channel IFCTLs) 160 and 161, and disk interface units (disk IFCTLs) 170 and 171. (IO module) 130, 131 is shown as an example, but this is merely an example of implementation, and the present invention is not limited to the example of implementation of each module shown in FIG. When each is mounted as a separate module, or the input / output control units (IOCTLs) 180 and 181 and the CPUs 110 and 111 are mounted on the same board, and the channel interface units (channel IFCTLs) 160 and 161 and the disk interface unit (disk IFCTL) 170, 171 and separate modules Implementation, such as when implementing Te are possible.

  The storage control device 100 according to the first embodiment of the present invention includes a central processing unit (CPU) 110 having a memory (1) 120 as a main storage device, a channel interface unit (channel IFCTL) 160 connected to the host computer 20, and a storage. An input / output control module (IO module) 130 including a disk interface unit (disk IFCTL) 170 connected to the apparatus 30, a memory (2) 150 that is a cache memory, and an input / output control unit (IOCTL) 180 that controls input / output; It is composed of

  In the first and second embodiments shown in FIG. 1 or FIG. 3, in one of the storage control devices 100 and 101 of the storage control system 10, that is, only in the storage control device 100, the main storage device (memory 1) 120 is a battery or a storage battery. It is composed of volatile memory that is backed up by a battery so that the non-volatility is maintained for a predetermined time by the accumulated power (the stored data is retained for a predetermined time even when the power is turned off) The controller 101 does not employ the configuration of the battery-backed volatile memory.

  In the third embodiment of the present invention, as shown in FIG. 4, in both the storage control device 100 and the storage control device 101, both the main storage device (memory 1) 120 and the cache memory (memory 2) are batteries or It is composed of a volatile memory that is backed up by a battery so that the non-volatility is maintained for a predetermined time by the electric power stored in the storage battery (stored data is held for a predetermined time even when the power is turned off).

In the third embodiment of the present invention, when data is duplicated, not only the main storage device (memory 1) 120 and cache memory (memory 2) of the own storage control device 100 but also the other storage control device 101. The main storage device (memory 1) 120 and the cache memory (memory 2) can also be used as a cache device, and the number of other storage control devices 101 can be increased to a plurality of storage devices. The size of the memory space of the cache device that performs data input / output control can be greatly increased.
[Control flow of storage controller]

  The contents of each process of the storage control apparatus of the present invention will be described below. 5 to 10 are flowcharts showing the contents of each process of the storage control apparatus according to the first to third embodiments of the present invention. FIG. 6 is a data write process, and FIG. 7 is a process storage area at the time of data write. FIG. 8 shows a data read (Read) process, FIG. 9 shows a process storage area securing process at the time of data read, and FIG. 10 shows a drive data transfer process for data backup and remote copy.

  FIG. 5 is a flowchart showing the contents of host input / output (IO) processing of the storage controller of the present invention. In FIG. 5, when the host IO process is started, in step 501, an input / output command (IO) is received from the host computer 20, a CMD (Command) determination is performed, and a write process or a read process is performed. (Read) The IO type of processing is determined. The host IO processing can be performed by hardware control by the input / output control unit (IOCTL) 180 of the input / output control module (IO module) 130, and the battery is backed up even after the power is turned off. Within a predetermined time, the central processing unit (CPU) 110 can be controlled by software control using an input / output control program 141 stored in a battery-backed main memory (memory 1).

  Next, in step 503, when it is a write process (Yes), the process proceeds to step 504, where the write process is executed, and the host input / output (IO) process is terminated. In step 503, if it is not a write process (No), the process proceeds to step 505, a read process is executed, and the host input / output (IO) process is terminated.

  FIG. 6 is a flowchart showing the contents of the data write (Write) process of the storage control apparatus of the present invention. The data write process shown in FIG. 6 corresponds to step 504 of the host IO process shown in FIG.

  In FIG. 6, when the data write process is started, a storage area is secured in the cache area (memory 1, 2) in step 601. In the case of the first embodiment, a storage area is secured in the cache area of the main memory (memory 1) backed up by the battery and the cache memory (memory 2) in the input / output module (IO module) 130. In this case, a storage area is secured in the cache area of the battery-backed main memory (memory 1) and the battery-backed cache memory (memory 2) in the input / output module (IO module) 130.

  In the case of the third embodiment, the main battery backed up main storage device (memory 1), the battery backed up cache memory (memory 2) in the input / output control module (IO module) 130, and A storage area is secured in the cache area of the other battery-backed main memory (memory 1) and the battery-backed cache memory (memory 2) in the input / output module (IO module) 130.

  Subsequently, in step 602, the write data is stored in the cache, the data is double-written in each cache area (memory 1, 2), and the status information in the storage area management table is updated, The write process is terminated. When necessary, the data written in each cache area (memory 1, 2) is read from each cache area (memory 1, 2) and written to the disk devices 31, 32 of the storage device 30 at a predetermined time. Processing is done.

  In the description of the above embodiment, an input / output command (IO) from the host computer 20 is received, CMD (Command) determination is performed, and the IO type of write processing or read processing is read. Although it has been described that the data is double-written in the case of the write processing, the input / output command (IO) transmitted from the host computer and the type of data are determined. When it is determined whether or not the transmission data is control data, and it is determined that the transmission data is control data, a data storage area is secured in a nonvolatile memory or a battery-backed volatile memory and the control data It can be configured to perform double writing.

  FIG. 7 is a flowchart showing the contents of the storage area securing process of the data write (Write) process of the storage control apparatus of the present invention. FIG. 7 corresponds to step 601 of the data write process shown in FIG. In FIG. 7, when the storage area securing process of the data write process is started, the storage area management table is searched / referenced in step S701. The storage area management table corresponds to, for example, the memory management table 200 and the memory address data table in FIG. The memory management table 200 stores information such as a head address 201, 202 an end address 202, 203 a management unit 203, usage 204, etc., and a memory address data table 210 includes a cache address 211, a drive number 212, a drive address 213, a status Information such as 214 is stored.

  In the case of the first embodiment of FIG. 1, for example, the storage area management table is stored in the main memory (memory 1) backed up by the battery, and in the case of the second and third embodiments of FIGS. Are stored in the cache memory (memory 2) and searched / referenced by a central processing unit (CPU) 110 that performs input / output software control or an input / output control unit (IOCTL) that performs input / output hardware control. The

  Subsequently, in step 702, an area for the data size is secured in the battery-backed non-volatile memory, and the storage area securing process of the data writing process is terminated. In the case of data write processing, the address area of the write destination is sufficiently large to store the data size, and is non-volatile, that is, data is erased even when the power is turned off. It is particularly important to ensure no memory area.

  FIG. 8 is a flowchart showing the contents of data read (Read) processing of the storage control apparatus of the present invention. In FIG. 8, when the data read (Read) process is started, it is determined in step 801 whether or not the data requested to be read from the host computer 20 exists in the memory.

  Similarly to the data write (Write) process, the data read (Read) process can also be performed by hardware control by the input / output control unit (IOCTL) 180 of the input / output control module (IO module) 130. Even after the disconnection, the central processing unit (CPU) 110 performs software control by using the input / output control program 141 stored in the battery-backed main memory (memory 1) within a predetermined time after the battery backup. Is possible.

In step 801, if the data exists in the memory (Yes), the process proceeds to step 804. In step 804, the requested data is transferred to the host computer 20, and the data read (Read) process is terminated.
In step 801, if the data does not exist in the memory (No), the process proceeds to step 802. In step 802, a storage area is secured in the volatile memory, and in step 803, the data is transferred from the storage device (drive) 30. Perform staging processing to store in volatile memory. In the case of data reading (Read) processing, double data writing is not performed. Next, in step 804, the request data (staged data) stored in the volatile memory is transferred to the host computer, and the data read (Read) process is terminated.

  FIG. 9 is a flowchart showing the contents of the storage area securing process of the data read (Read) process of the storage control apparatus of the present invention. FIG. 9 corresponds to step 802 of the data reading (Read) process in FIG. In FIG. 9, when the storage area securing process of the data read (Read) process is started, the storage area management table is searched and referenced in step 901, and an area for the data size is secured in the volatile memory in step 902. Thus, the storage area securing process of the data reading process is completed.

  The storage area management table corresponds to, for example, the memory management table 200 and the memory address data table in FIG. The memory management table 200 stores information such as a head address 201, 202 an end address 202, 203 a management unit 203, usage 204, etc., and a memory address data table 210 includes a cache address 211, a drive number 212, a drive address 213, a status Information such as 214 is stored.

  In the case of the first embodiment of FIG. 1, for example, the storage area management table is stored in the main memory (memory 1) backed up by the battery, and in the case of the second and third embodiments of FIGS. Are stored in the cache memory (memory 2) and searched / referenced by a central processing unit (CPU) 110 that performs input / output software control or an input / output control unit (IOCTL) that performs input / output hardware control. The

  FIG. 10 is a flowchart showing the contents of the data backup and remote copy drive data transfer processing of the storage controller of the present invention. In FIG. 10, when the data transfer process is started, in step 1001, the cache memory (memory 2) of the input / output control module (IO module) 130 of the storage control device 100 or the memory of the other system (storage control device 101) is stored. Storage area reservation processing is performed.

  Next, in step 1002, data is read (Read) from the storage device (drive) 30, and data is written (Write) to the memory (for example, the main memory (memory 1) 120 backed up by the battery in the first embodiment). And a staging process for reading data from the storage device (drive) 30 to the volatile memory is performed.

  Subsequently, in step 1003, a data transfer process for transferring the staging data stored in the volatile memory to the memory 2 or another memory is performed, and in step 1004, a storage area release process for the volatile memory is performed to perform a data transfer process. Exit.

  By performing the processing from step 1001 to step 1004 of the data transfer processing within a predetermined time in which the non-volatility of the memory is maintained by battery backup, no data is lost even if the power is cut off. Data transfer processing can be performed quickly and efficiently.

  The storage control device and the storage system of the present invention can be adapted to a storage system in which various memories are connected by a network and controlled by a central processing unit having a main storage device. This contributes to ensuring the reliability of the storage device and improving the utilization efficiency.

FIG. 1 is a schematic overall view of a storage system including a storage control apparatus according to a first embodiment of the present invention. FIG. 2 is a diagram showing an example of a storage area management table showing the configuration of the memory space of the storage control apparatus of the present invention. FIG. 3 is a schematic overall view of a storage system including the storage control apparatus according to the second embodiment of the present invention. FIG. 4 is a schematic overall view of a storage system including the storage control apparatus according to the third embodiment of the present invention. FIG. 5 is a flowchart showing the contents of host input / output (IO) processing of the storage controller of the present invention. FIG. 6 is a flowchart showing the contents of the data write (Write) process of the storage control apparatus of the present invention. FIG. 7 is a flowchart showing the contents of the storage area securing process of the data write (Write) process of the storage control apparatus of the present invention. FIG. 8 is a flowchart showing the contents of data read (Read) processing of the storage control apparatus of the present invention. FIG. 9 is a flowchart showing the contents of the storage area securing process of the data read (Read) process of the storage control apparatus of the present invention. FIG. 10 is a flowchart showing the contents of the data backup and remote copy drive data transfer processing of the storage controller of the present invention. FIG. 11 is a schematic overall view of a storage system including a conventional nonvolatile memory.

Explanation of symbols

10 Storage control system 20, 21 Host computer 30 Storage device (drive)
31, 32 Disk device 100, 101 Storage control device 110, 111 Central processing unit (CPU)
120, 121 Main memory (memory 1)
130, 131 I / O control module (IO module)
141 Program 142 Management Information 143 User Data 1
144 User data 2
150, 151 cache memory (memory 2)
160, 161 Channel interface (channel IFCTL)
170,171 Disk interface part (disk IFCTL)
180,181 Input / output control unit (IOCTL)
200 Memory management table 201 Start address 202 End address 203 Management unit 204 Application 210 Memory address data table 211 Cache address 212 Drive number 213 Drive address 214 Status

Claims (9)

In a storage control device comprising a central processing unit connected to a main storage device, a channel interface unit connected to a host computer, a disk interface unit connected to a disk drive device, and an input / output control unit connected to the storage device ,
The main storage device is constituted by a battery-backed volatile memory in which data non-volatility is maintained for a predetermined time after the power is turned off, and the battery-backed main storage device and the storage device of the input / output controller To form a memory address space as a cache device of the storage control device, read data stored in the disk drive device and write data to the cache device, and read data stored in the cache device and A storage control device that performs a destaging process for writing to a disk drive device. The storage control device according to claim 1.
Storage characterized by determining the type of input / output command and input / output data in response to a request command from the host computer, and performing data input / output processing in a different manner depending on the input / output command and input / output type Control device. The storage control device according to claim 2, wherein
If the determined input / output instruction is a write instruction, the storage management table is searched / referenced, an area corresponding to the data size is secured in the battery-backed main storage device, data is double-written, and a read instruction In this case, the storage control device is characterized in that an area for the data size is secured in the battery-backed main storage device, the data from the disk drive device is stored, and the requested data is transferred to the host computer. The storage control device according to claim 1.
In the case of data transfer processing in response to a request command from a host computer, a storage area of a storage device connected to the input / output control unit or another remote storage device is secured, and the battery is transferred from the disk drive device to the battery. The data read into the backed up main storage device is transferred to the storage device connected to the input / output control unit or another remote storage device, and then the storage area of the battery backed up main storage device is released. Storage controller. In a storage control device comprising a central processing unit connected to a main storage device, a channel interface unit connected to a host computer, a disk interface unit connected to a disk drive device, and an input / output control unit connected to the storage device ,
The main storage device and the storage device of the input / output control unit are configured by a battery-backed volatile memory in which data non-volatility is maintained for a predetermined time after the power is turned off, and the battery-backed main storage device And a storage device backed up by the battery of the input / output control unit to form a memory address space as a cache device of the storage control device, and read data stored in the disk drive device and write to the cache device And a destaging process for reading the data stored in the cache device and writing it in the disk drive device. The storage control device according to claim 5, wherein
Storage characterized by determining the type of input / output command and input / output data in response to a request command from the host computer, and performing data input / output processing in a different manner depending on the input / output command and input / output type Control device. The storage control device according to claim 6.
If the determined input / output command is a write command, the storage management table is searched and referenced, and an area for the data size is stored in the battery-backed main storage device and the battery-backed storage device of the input / output control unit. In the case of a read command, a disk drive device is provided by securing an area for the data size in the battery-backed main storage device and the battery-backed storage device of the input / output control unit. A storage control apparatus for storing data from the server and transferring request data to a host computer. The storage control device according to claim 5, wherein
In the case of data transfer processing in response to a request command from a host computer, a storage area of a storage device connected to the input / output control unit or another remote storage device is secured, and the battery is transferred from the disk drive device to the battery. After transferring the data read into the backup storage device and the storage device of the input / output control unit backed up to the battery to the storage device connected to the input / output control unit or another remote storage device, the battery backed up main storage device A storage control device for releasing a storage area of a storage device and a storage device of the input / output control unit backed up by the battery. A plurality of storage controls including a central processing unit connected to the main storage device, a channel interface unit connected to the host computer, a disk interface unit connected to the disk drive device, and an input / output control unit connected to the storage device Equipment,
A host computer connected to the storage controller via the channel interface unit;
In a storage system having a disk drive device connected to the storage control device via the disk interface unit,
The main storage device of the plurality of storage control devices and the storage device of the input / output control unit are configured by a battery-backed volatile memory in which data non-volatility is maintained for a predetermined time after power is turned off. Cache of the storage system by the battery storage backed up main storage device of the own system, the battery backed up storage device of the input / output control unit, the battery backed up main storage device of the other system and the battery backed up storage device of the input / output control unit A staging process that forms a memory address space as a device, reads data stored in the disk drive device and writes the data to the cache device, and destaging processing reads data stored in the cache device and writes the data to the disk drive device It is characterized by performing Storage system.

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